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Loans Receivable (Additional Information Related To New Consumer Loan Assignments) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Contractual net cash flows at the time of assignment | [1] | $ 7,739.6 |  | $ 7,017.4 |  | $ 6,060.3 |
Expected net cash flows at time of assignment |  | 6,604.5 | [2] | 5,859.2 | [3] | 5,013.1 | [2]
Fair value at the time of assignment | [4] | 4,618.4 |  | 4,147.8 |  | 3,625.3 |
Financing Receivable, Credit Loss, Expense (Reversal) |  | (814.7) |  | (736.2) |  | (481.4) |
Expected future finance charges at the time of assignment | [5] | 2,307.0 |  | 2,033.9 |  | 1,731.5 |
Expected net Loan income at the time of assignment | [6] | 1,986.1 |  | 1,711.4 |  | 1,387.8 |
Dealer Loans [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Contractual net cash flows at the time of assignment | [1] | 5,613.6 |  | 4,579.3 |  | 3,874.4 |
Expected net cash flows at time of assignment |  | 5,090.0 | [2] | 4,154.8 | [2] | 3,516.1 | [3]
Fair value at the time of assignment | [4] | 3,578.3 |  | 2,933.7 |  | 2,530.0 |
Financing Receivable, Credit Loss, Expense (Reversal) |  | (537.3) |  | (427.7) |  | (240.4) |
Expected future finance charges at the time of assignment | [5] | 1,703.1 |  | 1,367.3 |  | 1,140.9 |
Expected net Loan income at the time of assignment | [6] | 1,511.7 |  | 1,221.1 |  | 986.1 |
Purchased Loans [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Contractual net cash flows at the time of assignment | [1] | 2,126.0 |  | 2,438.1 |  | 2,185.9 |
Expected net cash flows at time of assignment |  | 1,514.5 | [2] | 1,704.4 | [3] | 1,497.0 | [2]
Fair value at the time of assignment | [4] | 1,040.1 |  | 1,214.1 |  | 1,095.3 |
Financing Receivable, Credit Loss, Expense (Reversal) |  | (277.4) |  | (308.5) |  | (241.0) |
Expected future finance charges at the time of assignment | [5] | 603.9 |  | 666.6 |  | 590.6 |
Expected net Loan income at the time of assignment | [6] | 474.4 |  | 490.3 |  | 401.7 |
New Consumer Loan Assignments [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Financing Receivable, Credit Loss, Expense (Reversal) |  | (320.9) |  | (322.5) |  | (343.7) |
New Consumer Loan Assignments [Member] | Dealer Loans [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Financing Receivable, Credit Loss, Expense (Reversal) |  | (191.4) |  | (146.2) |  | (154.8) |
New Consumer Loan Assignments [Member] | Purchased Loans [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Financing Receivable, Credit Loss, Expense (Reversal) |  | $ (129.5) |  | $ (176.3) |  | $ (188.9) |
[1] | The Dealer Loans amount represents repayments that we were contractually owed at the time of assignment on Consumer Loans assigned under the Portfolio Program, less the related Dealer Holdback payments that we would be required to make if we collected all of the contractual repayments. The Purchased Loans amount represents repayments that we were contractually owed at the time of assignment on Consumer Loans assigned under the Purchase Program.
[2] | The Dealer Loans amount represents repayments that we expected to collect at the time of assignment on Consumer Loans assigned under the Portfolio Program, less the related Dealer Holdback payments that we expected to make. The Purchased Loans amount represents repayments that we expected to collect at the time of assignment on Consumer Loans assigned under the Purchase Program.
[3] | The Dealer Loans amount represents repayments that we expected to collect at the time of assignment on Consumer Loans assigned under the Portfolio Program, less the related Dealer Holdback payments that we expected to make. The Purchased Loans amount represents repayments that we expected to collect at the time of assignment on Consumer Loans assigned under the Purchase Program.
[4] | The Dealer Loans amount represents advances paid to Dealers on Consumer Loans assigned under the Portfolio Program. The Purchased Loans amount represents one-time payments made to Dealers to purchase Consumer Loans assigned under the Purchase Program.
[5] | Represents revenue that is expected to be recognized on a level-yield basis over the lives of the Loans.
[6] | Represents the amount that expected net cash flows at the time of assignment exceed Loans receivable at the time of assignment.

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